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in search of the perfect valve...

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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in search of the perfect valve...

Unread postAuthor: bobgengeskahn » Thu Jul 23, 2009 5:53 am

I am currently working on a little project that I have been thinking about for a few months now. I am converting a spring airsoft to a HPA/CO2 set up. my reasons for this are A. its really hard (much harder than I first thought) and B. converting a gas rifle is limited (IMO) because of the gas system that they have already designed for the rifle.

Basically I have a QEV set-up but am searching for some kind of electric valve, here is basically what I need it to do:

because space is limited I need this valve to switch between my CO2 power and a vent...

CO2 ------------- Valve ----------- Exhaust
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IN/Vent for QEV

There IS stuff out there, the only problem is that its not the right size or not the right PSIG for what I'm looking at (I'm hoping that I just haven't looked in the right place yet). I'm hoping to run at least 300 PSIG, but would like to have ability to go as far as 5-600 PSIG.
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Unread postAuthor: bobgengeskahn » Thu Jul 23, 2009 5:57 am

EDIT!!!!! The post was re-formattd when i posted it...


CO2
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Valve --------- IN/Vent for QEV
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Exhaust
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Unread postAuthor: qwerty » Thu Jul 23, 2009 6:39 am

Is the exhaust the barrel?
Are you gonna use regged or unregged co2 because a qev is not reccomended at unregged pressure.
Also for the chamber you would have to use iron fiitings and pipes.
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Unread postAuthor: daberno123 » Thu Jul 23, 2009 10:11 am

Use an electric 3-way valve to vent and fill a QEV. When in one position, the 3-way valve will let CO2 in from your tank. When you actuate the 3-way, it will close off the port to the CO2 and open one to the atmosphere which will vent the pilot volume of QEV, causing it to fire.

Be warned, new 3-way valves are expensive, but there are usually a few on eBay that go for pretty cheap.
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Unread postAuthor: ramses » Thu Jul 23, 2009 10:15 am

If you have machining facilities, you could make your own 3 way spool valve and operate it with a solenoid. You will want a 3 way pilot/fill valve.
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Unread postAuthor: bobgengeskahn » Thu Jul 23, 2009 5:06 pm

Yeah, my barrel will be my exhaust, and im using regulated CO2 through a 0-300 palmer reg.

Thanks for the info on the 3-way valves, I have been looking at them, but they are really really big and a lot of them are taking 24 vdc power, but if you say they exist I will have to keep looking.

Thanks again!
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Unread postAuthor: ramses » Thu Jul 23, 2009 5:13 pm

store bought, they are expensive. if you wanted to machine a spool valve and actuate it with a solenoid, it would be much cheaper, smaller, and could be built to withstand immense pressure. attached is a diagram of a 3 way spool valve. The "spool" slides in a "tube" with holes in it.
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Attachments
spool valve.JPG
The "Spool" in the valve pictured was supposed to have diameters of 1/4" and 1/8" The body was 9/16 tall, half inch thick, and around 2" long. It doesn't show O-ring grooves.
spool valve.JPG (9.15 KiB) Viewed 710 times
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Unread postAuthor: bobgengeskahn » Sat Jul 25, 2009 4:39 am

hmmmmmm... I like this very very much... although unfortunately, i dont really have the machining expertice to do this... however much I would absolutely love to be able to make my own valves :(
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Unread postAuthor: Willdebeers » Sat Jul 25, 2009 4:49 am

bobgengeskahn wrote:Yeah, my barrel will be my exhaust, and im using regulated CO2 through a 0-300 palmer reg.

Thanks for the info on the 3-way valves, I have been looking at them, but they are really really big and a lot of them are taking 24 vdc power, but if you say they exist I will have to keep looking.

Thanks again!


Do you mean something like this? > http://www.valves-online.co.uk/acatalog ... Valve.html ...But that is from the UK and pretty pricey.
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